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(1878-1959). Argentine lawyer and diplomat Carlos Saavedra Lamas led the negotiations that ended the Chaco War, fought from 1932 to 1935 between Bolivia and Paraguay over the northern part of the Gran Chaco region. He also developed the South American Antiwar Pact and presented it to the League of Nations, where it was signed by 11 countries. Lauded for these efforts, Saavedra Lamas was elected president of the League of Nations Assembly in 1936 and that same year received the Nobel prize for peace. (See also Nobel prizes.)